To provide low-carbon ferritic stainless steel, in which molten low-carbon ferritic stainless steel is cast in a mold and further a solidification structure is refined in the course of cooling until solidification and equiaxed crystals are increased, and also to provide its manufacturing method.
After decarburization refining of a molten iron, degassing refining is performed and further a deoxidizer is added to carry out deoxidation and, before the resulting molten steel is held in a ladle, B is added to obtain a molten steel having a composition containing, by mass, 0.01 to 0.07% C, 0.1 to 0.4% Si, 0.3 to 0.9% Mn, 0.05% P, 0.01% S, 0.01% Al, 14 to 18% Cr, 0.6% Ni, 0.003 to 0.08% B, 0.01 to 0.06% N and the balance Fe with inevitable impurities. Then the molten steel is held in a ladle and further cast in a mold out of the ladle to obtain a cast slab or a steel ingot.
ABE MASAMICHI
FUNAKAWA YOSHIMASA
YAMASHITA TAKAKO
KARIYA KAZUHIRO
